PT

1. Pacific Time
2. Personal trainer, or training
3. Physical therapy
4. Physical training
5. Postal telegraph
6. Pupil teacher
7. Purchase tax (historical)

pt

1. Part
2. Past
3. Past tense
4. Pint or pints
5. Point
6. Port
7. Post-town

Pt (chem)

Platinum

• cleaning lady
• cleanings
• cleaning woman
• cleaning women
• cleanlier
• cleanliest
• clean-limbed
• cleanliness
• cleanlinesses
• clean-living
• cleanly
• cleanness
• cleannesses
• clean out
• clean-out
• clean-outs
• clean room
• clean rooms
• cleans
• cleansable
• cleanse
• cleansed
• cleanser
• cleansers
• cleanses